The Clark Unit Hydrograph Method shall be used in conjunction with HEC-1 for all watersheds greater than or equal to 160 acres, for design of detention basins; and where hydrograph channel or storage routing and combination is necessary. The Clark Unit Hydrograph method shall be applied in conformance with the procedures set forth in the ADOT Hydrology Manual.
(Res. 1637, passed 2-28-02)